Question

calculati folodind scoatera unui factor comun .a.29×55×29×45;b.40×87-38×40;c.368×999+368​

Answer 1

Răspuns:

Explicație pas cu pas:

a)

29 × 55 + 29 × 45 = 29 × ( 55 + 45 ) = 29 × 100 = 2 900

29 × 55 - 29 × 45 = 29 × ( 55 - 45 ) = 29 × 10 = 290

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b)

40 × 87 - 38 × 40 = 40 × ( 87 - 38 ) = 40 × 49 = 1 960

daca in loc de 38 era 37, atunci avem:

40 × 87 - 37 × 40 = 40 × ( 87 - 37 ) = 40 × 50 = 2 000

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c)

368 × 999 + 368 × 1 = 368 × ( 999 + 1 ) = 368 × 1 000 = 368 000

Answer 2

Răspuns:

Explicație pas cu pas:

a) 29×55+29×45 = 29 x (55 + 45) = 29 x 100 = 2900

b) 40×87-38×40 = 40 x (87 - 38) = 40 x 49 = 1960

c) 368×999+368​ = 368 x (999 + 1) = 368 x 1000 = 368000